* {
    padding: 0;
    margin: 0;
}

.wrap {
    position: relative;
    width: 400px;
    height: 600px;
    margin: 120px auto;
    border: 1px solid #333;
    overflow: hidden;
}

.wrap button {
    position: absolute;
    top: 0;
    z-index: 1024;
    border: none;
    vertical-align: top;
    background: none;
    outline: none;
    cursor: pointer;
    width: 100%;
    height: 100px;
    border-bottom: 3px dashed #eee;
    font-size: 60px;
    color: pink;
    background-color: #fff;
    /* display: none; */
}

.main {
    /*为了让盒子能动起来 */
    position: relative;
    top: -150px;
    width: 400px;
    height: 600px;
    /* border: 1px solid red; */
}

.row {
    height: 150px;
}

.row div {
    float: left;
    width: 100px;
    height: 150px;
    box-sizing: border-box;
    border-left: 1px solid #222;
    border-bottom: 1px solid #222;
    cursor: pointer;
}